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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2012
Commitments and Contingencies [Abstract]  
Summary of minimum future rental payments
         

Year 1

  $ 13,052  

Year 2

    12,242  

Year 3

    10,697  

Year 4

    5,606  

Year 5

    2,821  

Thereafter

    9,231  
   

 

 

 

Total

  $ 53,649